C#########################################################
C This file is part of OpenAD released under the LGPL.   #
C The full COPYRIGHT notice can be found in the top      #
C level directory of the OpenAD distribution             #
C#########################################################
C
C$OPENAD XXX File_start [head.f]
      SUBROUTINE head(X, Y)
          use OAD_tape
          use OAD_rev
          use OAD_cp

C original arguments get inserted before version
C         ! and declared here together with all local variables
C         ! generated by xaifBooster

      use OAD_active
      use w2f__types
      use oad_intrinsics
      use oad_intrinsics
      use oad_intrinsics
      IMPLICIT NONE
C
C     **** Global Variables & Derived Type Definitions ****
C
      INTEGER(w2f__i8) OpenAD_Symbol_0
      INTEGER(w2f__i8) OpenAD_Symbol_1
      INTEGER(w2f__i8) OpenAD_Symbol_10
      INTEGER(w2f__i8) OpenAD_Symbol_11
      INTEGER(w2f__i8) OpenAD_Symbol_2
      INTEGER(w2f__i8) OpenAD_Symbol_3
      INTEGER(w2f__i8) OpenAD_Symbol_4
      INTEGER(w2f__i8) OpenAD_Symbol_5
      INTEGER(w2f__i8) OpenAD_Symbol_6
      INTEGER(w2f__i8) OpenAD_Symbol_7
      INTEGER(w2f__i8) OpenAD_Symbol_8
      INTEGER(w2f__i8) OpenAD_Symbol_9
C
C     **** Parameters and Result ****
C
      type(active) :: X(1:2)
      type(active) :: Y(1:2)
C
C     **** Local Variables and Functions ****
C
      type(active) :: OpenAD_prp_0


C checkpointing stacks and offsets
          integer :: cp_loop_variable_1,cp_loop_variable_2,cp_loop_varia
     +ble_3,cp_loop_variable_4,cp_loop_variable_5,cp_loop_variable_6

C floats 'F'
          double precision, dimension(:), allocatable, save :: theArgFSt
     +ack
          integer, save :: theArgFStackoffset=0, theArgFStackSize=0
C integers 'I'
          integer, dimension(:), allocatable, save :: theArgIStack
          integer, save :: theArgIStackoffset=0, theArgIStackSize=0
C booleans 'B'
          logical, dimension(:), allocatable, save :: theArgBStack
          integer, save :: theArgBStackoffset=0, theArgBStackSize=0
C strings 'S'
          character*(80), dimension(:), allocatable, save :: theArgSStac
     +k
          integer, save :: theArgSStackoffset=0, theArgSStackSize=0

          type(modeType) :: our_orig_mode

C external C function used in inlined code
          integer iaddr
          external iaddr
C
C     **** Top Level Pragmas ****
C
C$OPENAD INDEPENDENT(X)
C$OPENAD DEPENDENT(Y)
C
C     **** Statements ****
C

          if (our_rev_mode%arg_store) then
C store arguments
          end if
          if (our_rev_mode%arg_restore) then
C restore arguments
          end if
          if (our_rev_mode%plain) then
            our_orig_mode=our_rev_mode
            our_rev_mode%arg_store=.FALSE.
C original function
C$OPENAD XXX Template ad_template.f
      IF (X(1)%v.LE.X(2)%v) THEN
        Y(1)%v = (X(2)%v-X(1)%v)
      ELSE
        Y(1)%v = (X(1)%v-X(2)%v)
      ENDIF
      IF (Y(1)%v.eq.0.0D00) THEN
        Y(2)%v = X(1)%v
      ELSE
        Y(2)%v = Y(1)%v
      ENDIF

C original function end
            our_rev_mode=our_orig_mode
          end if
          if (our_rev_mode%tape) then
C            print*, " tape       ", our_rev_mode
            our_rev_mode%arg_store=.TRUE.
            our_rev_mode%arg_restore=.FALSE.
            our_rev_mode%plain=.TRUE.
            our_rev_mode%tape=.FALSE.
            our_rev_mode%adjoint=.FALSE.
C taping
C$OPENAD XXX Template ad_template.f
      IF (X(1)%v.LE.X(2)%v) THEN
        Y(1)%v = (X(2)%v-X(1)%v)
        OpenAD_Symbol_2 = 1_w2f__i8
        integer_tape(integer_tape_pointer) = OpenAD_Symbol_2
        integer_tape_pointer = integer_tape_pointer+1
      ELSE
        Y(1)%v = (X(1)%v-X(2)%v)
        OpenAD_Symbol_3 = 0_w2f__i8
        integer_tape(integer_tape_pointer) = OpenAD_Symbol_3
        integer_tape_pointer = integer_tape_pointer+1
      ENDIF
      IF (Y(1)%v.eq.0.0D00) THEN
        Y(2)%v = X(1)%v
        OpenAD_Symbol_4 = 1_w2f__i8
        integer_tape(integer_tape_pointer) = OpenAD_Symbol_4
        integer_tape_pointer = integer_tape_pointer+1
      ELSE
        Y(2)%v = Y(1)%v
        OpenAD_Symbol_5 = 0_w2f__i8
        integer_tape(integer_tape_pointer) = OpenAD_Symbol_5
        integer_tape_pointer = integer_tape_pointer+1
      ENDIF

C taping end
            our_rev_mode%arg_store=.FALSE.
            our_rev_mode%arg_restore=.FALSE.
            our_rev_mode%plain=.FALSE.
            our_rev_mode%tape=.FALSE.
            our_rev_mode%adjoint=.TRUE.
          end if
          if (our_rev_mode%adjoint) then
C            print*, " adjoint    ", our_rev_mode
            our_rev_mode%arg_store=.FALSE.
            our_rev_mode%arg_restore=.TRUE.
            our_rev_mode%plain=.FALSE.
            our_rev_mode%tape=.TRUE.
            our_rev_mode%adjoint=.FALSE.
C adjoint
      integer_tape_pointer = integer_tape_pointer-1
      OpenAD_Symbol_0 = integer_tape(integer_tape_pointer)
      IF (OpenAD_Symbol_0.ne.0) THEN
        X(1)%d = X(1)%d+Y(2)%d
        Y(2)%d = 0.0d0
      ELSE
        OpenAD_prp_0%d = OpenAD_prp_0%d+Y(2)%d
        Y(2)%d = 0.0d0
        Y(1)%d = Y(1)%d+OpenAD_prp_0%d
        OpenAD_prp_0%d = 0.0d0
      ENDIF
      integer_tape_pointer = integer_tape_pointer-1
      OpenAD_Symbol_1 = integer_tape(integer_tape_pointer)
      IF (OpenAD_Symbol_1.ne.0) THEN
        X(1)%d = X(1)%d-Y(1)%d
        X(2)%d = X(2)%d+Y(1)%d
        Y(1)%d = 0.0d0
      ELSE
        X(2)%d = X(2)%d-Y(1)%d
        X(1)%d = X(1)%d+Y(1)%d
        Y(1)%d = 0.0d0
      ENDIF

C adjoint end
            our_rev_mode%arg_store=.FALSE.
            our_rev_mode%arg_restore=.TRUE.
            our_rev_mode%plain=.FALSE.
            our_rev_mode%tape=.TRUE.
            our_rev_mode%adjoint=.FALSE.
          end if
        end subroutine head
